Electric storage device and electric storage apparatus

Abstract

An electric storage device includes: an electrode assembly in which electrodes are wound such that paired curved portions and a straight portion connecting the paired curved portions are formed; a case which houses the electrode assembly, the case comprising a convex part protruding toward the straight portion of the electrode assembly to support the straight portion; and a support portion which supports the curved portion toward an inside of the electrode assembly.

What is claimed is: 
     
       1. An electric storage device, comprising:
 an electrode assembly in which electrodes are wound such that paired curved portions and a straight portion connecting the paired curved portions are formed; 
 a case which houses the electrode assembly, the case comprising a convex part only protruding toward the straight portion of the electrode assembly to support the straight portion; 
 a support portion which is in contact with the curved portion and supports the curved portion toward an inside of the electrode assembly; and 
 an insulating member disposed between the case and the electrode assembly to insulate the case from the electrode assembly, 
 wherein the support member is detachably attached to the insulating member, and 
 wherein the support member is configured to be elastically deformed due to contact between the support member and the curved portion. 
 
     
     
       2. The electric storage device according to  claim 1 , wherein the support portion supports at least one of the paired curved portions of the electrode assembly. 
     
     
       3. The electric storage device according to  claim 1 , wherein the case has a substantially rectangular frame-shaped section and houses the electrode assembly such that a side of the substantially rectangular frame-shaped section extends along the straight portion, and
 wherein the support portion is disposed in a corner portion of the substantially rectangular frame-shaped section in the case. 
 
     
     
       4. The electric storage device according to  claim 1 ,
 wherein the support portion is a part of the insulating member. 
 
     
     
       5. The electric storage device according to  claim 4 , wherein the insulating member includes a portion curved to bulge toward the electrode assembly, and the curved portion of the insulating member supports the curved portion of the electrode assembly. 
     
     
       6. The electric storage device according to  claim 1 , wherein a dimension of the support portion in a direction orthogonal to a winding direction of the electrodes is substantially equal to or greater than a dimension of the electrode assembly in the direction orthogonal to the winding direction. 
     
     
       7. The electric storage device according to  claim 1 , wherein the convex part of the case comprises a plurality of convex parts. 
     
     
       8. The electric storage device according to  claim 1 , wherein the case comprises a wall portion having a wave-shaped inner surface and a wave-shaped outer surface and having a substantially constant thickness, and
 wherein the wave-shaped inner surface forms a plurality of the convex parts, and the plurality of convex parts support the straight portion of the electrode assembly at intervals. 
 
     
     
       9. The electric storage device according to  claim 8 , wherein the case comprises a substantially rectangular bottom wall portion when viewed in a direction of a normal,
 wherein the wall portion comprises paired wall portions extending substantially vertically from paired long sides of the bottom wall portion, and 
 wherein a maximum clearance between the paired wall portions is greater than a dimension in a short-side direction of the bottom wall portion. 
 
     
     
       10. An electric storage apparatus comprising the electric storage device according to  claim 1  and a restraining member. 
     
     
       11. The electric storage device according to  claim 1 , wherein the convex part is in contact with the straight portion. 
     
     
       12. The electric storage device according to  claim 11 , wherein the convex part is in contact with the straight portion via the insulating member disposed between the case and the electrode assembly. 
     
     
       13. The electric storage device according to  claim 1 , wherein the insulating member abuts the convex part and the straight portion. 
     
     
       14. The electric storage device according to  claim 1 , wherein the support portion abuts the curved portion.